🏆 The most innovative open-source bike computer that outperforms commercial alternatives
"GPS navigators were inaccurate, expensive ones were basic... so I decided to create my own"
This isn't just another Arduino project—it's a revolution in affordable cycling technology. While Garmin charges $300+ for basic functionality, this project delivers professional-grade bike computer features for under $20.
Born from frustration with expensive, limited bike computers, this project proves that innovation beats corporation. Using a simple Hall sensor and magnet, we've created a system that's more accurate than GPS and more feature-rich than most commercial alternatives.
Real bike computer in action - smooth, professional, and completely DIY
- Instant Speed: Precise velocity measurement (m/s or km/h)
- Smart Distance Tracking: Cumulative and session distance
- Acceleration Monitoring: Real-time acceleration with max detection
- Intelligent Averaging: Separate averages for total and moving time
- Live Velocity Graphs: 1, 3, 5, and 15-minute real-time plots
- Historical Data: EEPROM persistence across power cycles
- 8 Display Modes: Comprehensive data at your fingertips
- Smart Display Management: Auto-brightness and sleep modes
- Ultra-Low Power: Powered by any USB power bank
- Intelligent Sleep: Automatic display management
- Instant Wake: Motion-activated display
- Debounced Sensors: Rock-solid reliability in real conditions
- Hall Sensor Accuracy: More precise than GPS for speed/distance
- Configurable Calibration: Perfect for any wheel size
- Noise Filtering: Advanced algorithms prevent false readings
- Professional UI: Clean, readable display even in sunlight
Professional wiring diagram - enterprise-level engineering made simple
- Arduino Uno/Nano: $5
- Hall Sensor KY-035: $2
- LCD 16x2 I2C: $4
- Push Button: $1
- Neodymium Magnet: $2
- Power Bank: $6
-
Clone the repository:
git clone https://github.com/astrosander/arduino-speedometer.git cd arduino-speedometer -
Install required libraries:
LiquidCrystal_I2CEncButtonGyverTimer
-
Upload firmware:
- Open
firmware/Speedometr/Speedometr.inoin Arduino IDE - Configure your wheel circumference in
lenvariable - Upload to your Arduino
- Open
-
Wire according to the diagram and mount on your bike!
- Arduino + Power Bank: Secure to bike frame
- Hall Sensor: Mount on fork with hot glue
- Magnet: Attach to spoke
- LCD Display: Mount on handlebars for perfect visibility
- Main Dashboard: Speed + Distance + Time
- Live Velocity Graph: Real-time speed visualization
- Performance Stats: Max speed + Max acceleration
- Averages: Overall and moving averages
- Time Tracking: Session and total time
- 1-Minute Graph: Short-term velocity trends
- 3-Minute Graph: Medium-term analysis
- 15-Minute Graph: Long-term performance tracking
- Noise Filtering: Prevents false triggers from vibration
- Acceleration Limits: Filters impossible readings (unless you're an astronaut! 🚀)
- Smart Averaging: Distinguishes between moving and stopped time
- Memory Management: Efficient EEPROM usage for data persistence
Real installations on actual bikes - weatherproof and road-tested
✅ Tested in real cycling conditions
✅ Weatherproof installation
✅ Vibration resistant
✅ Long-term reliability proven
- Democratizes Technology: High-end bike computer features for everyone
- Educational Value: Perfect Arduino project for learning embedded systems
- Customizable: Full source code means infinite possibilities
- Community Driven: Your contributions make it better for everyone
We welcome contributions! Whether it's:
- 🐛 Bug fixes
- ✨ New features
- 📚 Documentation improvements
- 🧪 Testing on different hardware
- 🎨 UI enhancements
| Feature | This Project | Garmin Edge 130 ($200) | Wahoo ELEMNT ($250) |
|---|---|---|---|
| Price | $20 | $200 | $250 |
| Real-time graphs | ✅ 4 timeframes | ❌ | Basic |
| Custom firmware | ✅ Full access | ❌ | ❌ |
| Battery life | Days (power bank) | 15 hours | 17 hours |
| Accuracy | Hall sensor precision | GPS (±3m error) | GPS (±3m error) |
| Customization | Unlimited | Limited | Limited |
This project is perfect for:
- 🎯 Arduino beginners: Well-commented, modular code
- 🔧 Hardware enthusiasts: Real-world sensor integration
- 📊 Data scientists: Algorithm development and optimization
- 🚴♂️ Cyclists: Understanding the tech behind bike computers
- 👨🎓 Students: Practical embedded systems project
This project is MIT Licensed - completely free to use, modify, and distribute.
Build it, hack it, improve it, sell it - just keep it open source! 💖
If this project saved you hundreds of dollars and inspired your next build:
⭐ Star this repository to help others discover it
🍴 Fork it and make it your own
📢 Share it with your cycling and maker communities
🐛 Report issues to help improve it
💡 Suggest features for future versions
🚴♂️ Happy Cycling! 🚴♀️
Made with 💖 by astrosander
"Innovation doesn't require a corporation - just passion and creativity"
⚡ Ready to build your own? The future of affordable bike computers starts here! ⚡